US3588858A - Safety alarm system - Google Patents

Safety alarm system Download PDF

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Publication number
US3588858A
US3588858A US735251A US3588858DA US3588858A US 3588858 A US3588858 A US 3588858A US 735251 A US735251 A US 735251A US 3588858D A US3588858D A US 3588858DA US 3588858 A US3588858 A US 3588858A
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Prior art keywords
alarm
transmitter
radio
receiver
alarm system
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Expired - Lifetime
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US735251A
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Thomas P Demuth
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Atlantic Richfield Co
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Atlantic Richfield Co
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/04—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons

Definitions

  • the switch is selected to activate at any position which a person would normally assume if he were injured or incapacitated, such as a prone position.
  • the transmitter can also be equipped with a manual switch in combination with a positionsensitive switch so that it can also be used as an alarm system even when the individual is not incapacitated.
  • RECEIVER TIME DELAY- TRANSMITTER RADIO RECEIVER MEANS MEANS MEANS AND RELAY 7 as 16 TEsT ALARM MEAN
  • An object of this invention has been to develop an alarm system which is automatically activated when a person becomes incapacitated, said system not requiring constant surveillance by other personnel in order to receive the alarm.
  • this invention comprises a safety alarm system which transmits an alarm when a persons body is placed in any position other than a normal working position, comprising in combination a. a radio transmitter which broadcasts a signal in response to a position-sensitive activation means,
  • a radio receiver located within the broadcast area of the radio transmitter.
  • an alarm display means which is activated in response to a signal from the radio transmitter.
  • FIGURE there are shown the three basic units of the alarm system, namely; the battery-operated individual portable transmitter 6, the electrically operated radio receiver and relay 7, and the alarm receiver and display 8.
  • the radio transmitter 9 can be activated by either the manual switch 10 or the position-sensitive switch 11. These switches are connected in parallel to the transmitter 9.
  • the radio transmitter 9 can be a commercial form of transmitter such as a model 6-390 transmitter made by Perma-Power Company of Chicago, Illinois, which must be modified to incorporate the position-sensitive switch 11.
  • the portable transmitter should be small enough to be carried by the individual in a manner not to substantially interfere with freedom of movement, yet to allow the position-sensitive switch to activate the transmitter should the individual become incapacitated.
  • the radio signal of the transmitter would be controlled for operation within the frequency 26.97 to 27.23 mc. in order to comply with FCC Rules; part ncidential and Restricted Radiation Devices.”
  • the positionsensitive switch can be of the mercury-type switch designed to activate the transmitter should the switch be taken out of the vertical position. It is preferred that the switch be required to move at least 30 from the vertical position before activating the transmitter in order to prevent activation through normal body movement.
  • the electrically operated radio receiver and relay 7 must be located within receiving range of the radio transmitter 9.
  • the radio receiver 12 through its power supply 13 remains in a continuous listening mode.
  • Said receiver 12 may be a commercial form of receiver, such as the model 0-270 receiver made by Perma-Power Company of Chicago, Illinois.
  • an audible alarm 14 may be heard locally.
  • the alarm signal travels through the time delay means 15 en route to the relay transmitter 16, which in turn sends the alarm signal from the area of alarm origin to all areas equipped to receive such signals, such equipment to be subsequently described.
  • the reset button 17 allows for deactivation of the alarm system.
  • the radio receiver must be tuned to the same frequency as the portable transmitter output signal and located within the broadcast area where such transmitter will be used.
  • the audi' ble alarm is adapted to use as a testing means whereby an individual can activate the transmitter to insure that it is functioning properly. It is also useful in that it will give a warning to personnel within the area of alarm origin should the transmitter be activated erroneously.
  • the time delay means may be adjusted for a time delay of 1 second to 2 minutes and preferably from 5 to 30 seconds. Its purpose is to allow for local alarm testing and/or erroneous activation of the transmitter without allowing the alarm signal to leave its area of origin.
  • the reset button for the alarm system has been so located as to be a safety feature for the alarm system in that the deliberate act of resetting the button must take place within the area of alarm origin.
  • the alarm receiver and display means 8 consists of an alarm receiver 18 which is wired directly to the relay transmitter 16, said alarm receiver activating the audible alarm 19 and/or visible alarm 20.
  • the alarm receiver can be located in one or more monitoring control areas as well as in each of the work areas where a radio receiver is located. In this manner all individuals working alone will be informed of some problem then existing.
  • the visual alarm should be adapted to indicate the sourceof the alarm by having individual alarm lights for each of the various radio receivers. The audible alarm will call attention to the fact that the system has been activated.
  • a safety alarm system which becomes activated when the body assumes a position other than a normal working position, said system comprising in combination:
  • a radio transmitter which broadcasts a signal in response to either activation means
  • an audible test alarm means fixed operably to the radio receiver means for testing the portable transmitter as well as to indicate to personnel at the alarm area that the unit has been activated
  • a relay transmitter operably fixed to said radio receiver via a time delay means whereby the signal received by said radio receiver is delayed for a period of time allowing for testing or erroneous activation of the radio transmitter and the local test alarm without activating the entire alarm system through said relay transmitter, and
  • an alarm display means which is activated in response to a signal from the relay transmitter.
  • each portable radio transmitter means and its respective radio receiver are set at predetermined fixed frequencies so as not to interfere with any other similar transmitter-receiver.
  • the safety alarm system of claim 1 wherein the display means is a visual lighting system adapted to indicate specific source of the alarm.
  • the safety alarm system of claim 1 wherein the display means is an audible alarm signal and a visual lighting system adapted to indicate the specific source of the alarm.

Abstract

A SAFETY ALARM SYSTEM DESIGNED FOR USE BY INDIVIDUALS WORKING ALONE CONSISTING OF A RADIO TRANSMITTER WHICH IS ACTIVATED BY A POSITION-SENSITIVE SWITCH AND A RADIO RECEIVER WHICH ACTIVATES AN ALARM MEANS WHICH INDICATES THAT THE PERSON HAS BEEN INJURED OR OTHERWISE INCAPCITATED. THE SWITCH IS SELECTED TO ACTIVATE AT ANY POSITION WHICH A PERSON WOULD NORMALLY ASSUME IF HE WERE INJURED OR INCAPACITATED, SUCH AS A PRONE POSITION. THE TRANSMITTER CAN ALSO BE EQUIPPED WITH A MANUAL SWITCH IN COMBINATION WITH A POSITION-SENSITIVE SWITCH SO THAT IT CAN ALSO BE USED AS AN ALARM SYSTEM EVEN WHEN THE INDIVIDUAL IS NOT INCAPACITATED

Description

United States Patent inventor Thomas P. Demuth Springfield, Pa. Appl. No. 735,251 Filed June 7, 1968 Patented June 28, 1971 Assignee Atlantic Richfield Company Philadelphia, Pa.
SAFETY ALARM SYSTEM 6 Claims, 1 Drawing Fig.
US. Cl 340/224, 325/64, 325/1 13, 340/279, 340/421 Int. Cl. G08b 7/06, G08b 25/00 Field of Search 340/224, 244, 245, 246, 271, 277, 279, 421; 325/51, 53, 55, 64, l 1 l, 1 13 Primary Examiner- Robert L. Richardson Attorney-Robert R. Cochran ABSTRACT: A safety alarm system designed for use by individuals working alone consisting of a radio transmitter which is activated by a position-sensitive switch and a radio receiver which activates an alarm means which indicates that the person has been injured or otherwise incapacitated. The switch is selected to activate at any position which a person would normally assume if he were injured or incapacitated, such as a prone position. The transmitter can also be equipped with a manual switch in combination with a positionsensitive switch so that it can also be used as an alarm system even when the individual is not incapacitated.
POSITION SENSITIVE /9 BATTERY OPERATED AcTIvATIoN MEANS RADIO INDlViDUAL PORTABLE TRAi'lSEwJg'ER TRANSMGITTER MANUAL AcTIvATIoN MEANs '2 POWER REsET SUPPLY BUTTON ELECTRICALLY OPERATED TIME DELAY RELAY REcEIvER TRANSMITTER 7 |TEsT ALARM MEANS I8 ALARM RECEIVER MEANS ALARM REcEIvER AND .I oooooooo DISPLAY 0000000 8 OOOOOO AuoIaLE MEANs VISUAL MEANS PATENTEn'Juuzsisn 3588'858 POSITION SENSITIVE BATTERY OPERATED ACTVATK)" MEANS RADIO lNDlVlDUAL PORTABLE a wgg \Q\\\ TRANSMITTER MANUAL i ACTIVATION MEANS '2 PowER REsET SUPPLY BUTTON 2:52:55? RECEIVER TIME DELAY- TRANSMITTER RADIO RECEIVER MEANS MEANS MEANS AND RELAY 7 as 16 TEsT ALARM MEAN| l8 [A| ARM RECEIVER MEANs] ALARAMNgECElvER l I DIS P L AY Q9 o o o c,- o o o 8 000000 AUDIBLE MEANS VISUAL MEANS INV/cw OI.
THOMAS P. DEMUTH SAFETY ALARM SYSTEM Much industrial work must of necessity be done by individuals working alone in isolated areas. One of the problems encountered in this situation is that of determining when this person has been injured so that proper medical assistance can be given. Alarms have been developed which an individual can activate manually in order to alert adjacent personnel of the occurrence of an accident. This system is ineffective, however, when the accident leaves the individual incapacitated and unable to activate the alarm. Various methods have been tried such as closed-circuit television to keep a constant surveillance upon those circulated people. This method, however, is expensive and it requires that at least one person continually scan the various areas to be sure that an accident has not occurred.
An object of this invention has been to develop an alarm system which is automatically activated when a person becomes incapacitated, said system not requiring constant surveillance by other personnel in order to receive the alarm.
In summary, this invention comprises a safety alarm system which transmits an alarm when a persons body is placed in any position other than a normal working position, comprising in combination a. a radio transmitter which broadcasts a signal in response to a position-sensitive activation means,
b. a radio receiver located within the broadcast area of the radio transmitter.
c. an alarm display means which is activated in response to a signal from the radio transmitter.
A more complete application of the invention and the many advantages thereof will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawing.
In the FIGURE there are shown the three basic units of the alarm system, namely; the battery-operated individual portable transmitter 6, the electrically operated radio receiver and relay 7, and the alarm receiver and display 8.
In the individual portable transmitter 6, the radio transmitter 9 can be activated by either the manual switch 10 or the position-sensitive switch 11. These switches are connected in parallel to the transmitter 9. The radio transmitter 9 can be a commercial form of transmitter such as a model 6-390 transmitter made by Perma-Power Company of Chicago, Illinois, which must be modified to incorporate the position-sensitive switch 11.
The portable transmitter should be small enough to be carried by the individual in a manner not to substantially interfere with freedom of movement, yet to allow the position-sensitive switch to activate the transmitter should the individual become incapacitated. The radio signal of the transmitter would be controlled for operation within the frequency 26.97 to 27.23 mc. in order to comply with FCC Rules; part ncidential and Restricted Radiation Devices." The positionsensitive switch can be of the mercury-type switch designed to activate the transmitter should the switch be taken out of the vertical position. It is preferred that the switch be required to move at least 30 from the vertical position before activating the transmitter in order to prevent activation through normal body movement.
The electrically operated radio receiver and relay 7 must be located within receiving range of the radio transmitter 9. The radio receiver 12 through its power supply 13 remains in a continuous listening mode. Said receiver 12 may be a commercial form of receiver, such as the model 0-270 receiver made by Perma-Power Company of Chicago, Illinois. When the receiver 12 receives a transmission an audible alarm 14 may be heard locally. The alarm signal travels through the time delay means 15 en route to the relay transmitter 16, which in turn sends the alarm signal from the area of alarm origin to all areas equipped to receive such signals, such equipment to be subsequently described. The reset button 17 allows for deactivation of the alarm system.
The radio receiver must be tuned to the same frequency as the portable transmitter output signal and located within the broadcast area where such transmitter will be used. The audi' ble alarm is adapted to use as a testing means whereby an individual can activate the transmitter to insure that it is functioning properly. It is also useful in that it will give a warning to personnel within the area of alarm origin should the transmitter be activated erroneously. The time delay means may be adjusted for a time delay of 1 second to 2 minutes and preferably from 5 to 30 seconds. Its purpose is to allow for local alarm testing and/or erroneous activation of the transmitter without allowing the alarm signal to leave its area of origin. The reset button for the alarm system has been so located as to be a safety feature for the alarm system in that the deliberate act of resetting the button must take place within the area of alarm origin.
The alarm receiver and display means 8 consists of an alarm receiver 18 which is wired directly to the relay transmitter 16, said alarm receiver activating the audible alarm 19 and/or visible alarm 20.
The alarm receiver can be located in one or more monitoring control areas as well as in each of the work areas where a radio receiver is located. In this manner all individuals working alone will be informed of some problem then existing. The visual alarm should be adapted to indicate the sourceof the alarm by having individual alarm lights for each of the various radio receivers. The audible alarm will call attention to the fact that the system has been activated.
The individual components of the alarm system hereinabove described are not novel and their use independently is well known to those skilled in the arts. The novelty of the invention lies in the combined use of these components in a novel manner to produce the desired results. While I have herein shown and described one form in which the invention may be employed, it may be readily understood that various variations and modifications in the invention may be introduced without departing from the spirit and scope of the novel conception thereof.
I claim:
1. A safety alarm system which becomes activated when the body assumes a position other than a normal working position, said system comprising in combination:
a. a position sensitive activation means,
b. a manual activation means,
c. a radio transmitter which broadcasts a signal in response to either activation means,
d. a radio receiver located within the broadcast area of the radio transmitter,
. an audible test alarm means fixed operably to the radio receiver means for testing the portable transmitter as well as to indicate to personnel at the alarm area that the unit has been activated,
f. a relay transmitter operably fixed to said radio receiver via a time delay means whereby the signal received by said radio receiver is delayed for a period of time allowing for testing or erroneous activation of the radio transmitter and the local test alarm without activating the entire alarm system through said relay transmitter, and
g. an alarm display means which is activated in response to a signal from the relay transmitter.
2. The safety alarm system of claim 1 wherein each portable radio transmitter means and its respective radio receiver are set at predetermined fixed frequencies so as not to interfere with any other similar transmitter-receiver.
3. The alarm system of claim 1 having a reset means on the radio receiver means that must be manually reset to silence the alann system once it has become activated.
4. The safety alarm system of claim 1 wherein the display means is an audible alarm.
5. The safety alarm system of claim 1 wherein the display means is a visual lighting system adapted to indicate specific source of the alarm.
6. The safety alarm system of claim 1 wherein the display means is an audible alarm signal and a visual lighting system adapted to indicate the specific source of the alarm.
US735251A 1968-06-07 1968-06-07 Safety alarm system Expired - Lifetime US3588858A (en)

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Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810097A (en) * 1973-02-28 1974-05-07 G Muir Method and system for visually conveying alarm information
US3866204A (en) * 1973-07-19 1975-02-11 James H Barkley Electronic medical warning device
US3911425A (en) * 1974-09-05 1975-10-07 Hrand M Muncheryan Alarm system for signalling for emergency help
US3914692A (en) * 1973-08-29 1975-10-21 Jr George C Seaborn Emergency communication system
US3947815A (en) * 1975-05-09 1976-03-30 Muncheryan Hrand M Automobile emergency-alerting system
US3987408A (en) * 1973-01-30 1976-10-19 Tmx, Inc. Vehicle anti-theft system
US3988713A (en) * 1974-06-19 1976-10-26 Sundstrand Data Control, Inc. Aircraft ground proximity warning instrument
US4019139A (en) * 1975-04-28 1977-04-19 Ortega Jose I Interaction multi-station alarm system
US4055839A (en) * 1975-07-25 1977-10-25 Locust Farms, Inc. Foaling alarm
FR2364039A1 (en) * 1976-09-13 1978-04-07 Auergesellschaft Gmbh Respirator monitoring and alarm system - gas consumption sensor which transmits signal to supervisor in radio communication with wearer (NL 5.3.78)
US4187494A (en) * 1977-11-04 1980-02-05 Jessee John W Vehicle guidance device
FR2433795A1 (en) * 1978-08-17 1980-03-14 Elimex Sa Monitor for route of surveillance personnel - uses portable set with coded transmissions for movement and position detectors which communicate with central monitor
US4253946A (en) * 1979-05-29 1981-03-03 Louis Ludwig Cleaning attachment for grain augers
US4292630A (en) * 1978-09-19 1981-09-29 Societe d'Etudes Techniques et Commerciales d'Automation Device for the obtaining of an electric signal which is proportional to an amount of movement and therefore capable of detecting any movement or acceleration
US4300129A (en) * 1978-09-06 1981-11-10 Cataldo Thomas R Silent wearable signalling device with tactile means to prevent false triggering
US4331953A (en) * 1979-12-26 1982-05-25 The Boeing Company Communication system for use in hazardous confined areas
DE3137024A1 (en) * 1981-09-17 1983-03-24 Siemens AG, 1000 Berlin und 8000 München IDENTIFICATION SYSTEM FOR FULLY AUTOMATIC PARTICIPANT LOCATION DETECTION IN A MOBILE COMMUNICATION NETWORK, ESPECIALLY IN A WIRED MOBILE COMMUNICATION NETWORK
US4523178A (en) * 1982-02-22 1985-06-11 Fulhorst George E Wireless alarm system in conjunction with at least one vehicle
US4557275A (en) * 1983-05-20 1985-12-10 Dempsey Jr Levi T Biofeedback system
US4754268A (en) * 1984-10-13 1988-06-28 Mitsuboshi Belting Ltd. Wireless mouse apparatus
US4800370A (en) * 1985-10-07 1989-01-24 I E Sensors, Inc. Wetness detection system
US4833725A (en) * 1987-09-10 1989-05-23 Teetor Thomas S Unintentional radio transmission detection system
US4906972A (en) * 1987-04-29 1990-03-06 The Boeing Company Communication system for hazardous areas
US4931772A (en) * 1985-11-14 1990-06-05 The Heil Company Safety monitor
US4978946A (en) * 1987-08-13 1990-12-18 Talkie Tooter (Canada) Ltd. Personal security communication system
US5036859A (en) * 1988-07-26 1991-08-06 Travis International, Inc. Moisture detector and indicator
US5045839A (en) * 1990-03-08 1991-09-03 Rand G. Ellis Personnel monitoring man-down alarm and location system
US5258743A (en) * 1991-07-29 1993-11-02 Uniplex Corporation Piezoelectric motion sensor
US5438320A (en) * 1993-04-09 1995-08-01 Figgie International Inc. Personal alarm system
FR2765989A1 (en) * 1997-07-11 1999-01-15 Godeux Michel J P Fall detection mechanism for old people surveillance
US5963130A (en) * 1996-10-28 1999-10-05 Zoltar Satellite Alarm Systems, Inc. Self-locating remote monitoring systems
US6198390B1 (en) 1994-10-27 2001-03-06 Dan Schlager Self-locating remote monitoring systems
US6552652B2 (en) * 2000-11-09 2003-04-22 Synergy Microsystems, Inc. Rescue device
FR2839800A1 (en) * 2002-05-17 2003-11-21 Haute Frequence Ingenierie Alarm system for isolated workman includes radio transmitter communicating with station linked to telephone network to send pre-recorded message
US20040028190A1 (en) * 2002-08-05 2004-02-12 Golden Brian C. Condition awareness system
US20040113794A1 (en) * 1994-10-27 2004-06-17 Dan Schlager Self-locating personal alarm system equipped parachute
US6828908B2 (en) 2002-02-06 2004-12-07 Ronald Scott Clark Locator system with an implanted transponder having an organically-rechargeable battery
US20070114092A1 (en) * 2005-10-31 2007-05-24 Caterpillar Inc. Hydraulic brake and steering system
US8035560B1 (en) 2007-11-20 2011-10-11 Adrian Glodz System and apparatus for tracking a person or an animal
US20160275764A1 (en) * 2012-12-04 2016-09-22 Honeywell International Inc. Door/window contact system

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3001743A1 (en) * 1980-01-18 1981-07-23 Triumph-Adler Aktiengesellschaft für Büro- und Informationstechnik, 8500 Nürnberg EMERGENCY CALL SYSTEM FOR USE BY ELDERLY AND / OR FRAGILE PERSONS
GB2125597A (en) * 1982-08-18 1984-03-07 Haley Radio Security Limited Alarm equipment
GB2225463A (en) * 1988-11-18 1990-05-30 Kenneth William Stephens Emergency warning means
GB2227344A (en) * 1989-01-19 1990-07-25 John Raymond Slater Radio operated personal attack alarm
GB2387006A (en) * 2002-03-28 2003-10-01 Motorola Inc Motorcycle wireless communication system employing a tilt sensor to detect an emergency situation which is transmitted to a remote location
GB2396043A (en) * 2002-12-04 2004-06-09 John Phizackerley Baby alarm with tilt sensor

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987408A (en) * 1973-01-30 1976-10-19 Tmx, Inc. Vehicle anti-theft system
US3810097A (en) * 1973-02-28 1974-05-07 G Muir Method and system for visually conveying alarm information
US3866204A (en) * 1973-07-19 1975-02-11 James H Barkley Electronic medical warning device
US3914692A (en) * 1973-08-29 1975-10-21 Jr George C Seaborn Emergency communication system
US3988713A (en) * 1974-06-19 1976-10-26 Sundstrand Data Control, Inc. Aircraft ground proximity warning instrument
US3911425A (en) * 1974-09-05 1975-10-07 Hrand M Muncheryan Alarm system for signalling for emergency help
US4019139A (en) * 1975-04-28 1977-04-19 Ortega Jose I Interaction multi-station alarm system
US3947815A (en) * 1975-05-09 1976-03-30 Muncheryan Hrand M Automobile emergency-alerting system
US4055839A (en) * 1975-07-25 1977-10-25 Locust Farms, Inc. Foaling alarm
FR2364039A1 (en) * 1976-09-13 1978-04-07 Auergesellschaft Gmbh Respirator monitoring and alarm system - gas consumption sensor which transmits signal to supervisor in radio communication with wearer (NL 5.3.78)
US4187494A (en) * 1977-11-04 1980-02-05 Jessee John W Vehicle guidance device
FR2433795A1 (en) * 1978-08-17 1980-03-14 Elimex Sa Monitor for route of surveillance personnel - uses portable set with coded transmissions for movement and position detectors which communicate with central monitor
US4300129A (en) * 1978-09-06 1981-11-10 Cataldo Thomas R Silent wearable signalling device with tactile means to prevent false triggering
US4292630A (en) * 1978-09-19 1981-09-29 Societe d'Etudes Techniques et Commerciales d'Automation Device for the obtaining of an electric signal which is proportional to an amount of movement and therefore capable of detecting any movement or acceleration
US4253946A (en) * 1979-05-29 1981-03-03 Louis Ludwig Cleaning attachment for grain augers
US4331953A (en) * 1979-12-26 1982-05-25 The Boeing Company Communication system for use in hazardous confined areas
DE3137024A1 (en) * 1981-09-17 1983-03-24 Siemens AG, 1000 Berlin und 8000 München IDENTIFICATION SYSTEM FOR FULLY AUTOMATIC PARTICIPANT LOCATION DETECTION IN A MOBILE COMMUNICATION NETWORK, ESPECIALLY IN A WIRED MOBILE COMMUNICATION NETWORK
US4523178A (en) * 1982-02-22 1985-06-11 Fulhorst George E Wireless alarm system in conjunction with at least one vehicle
US4557275A (en) * 1983-05-20 1985-12-10 Dempsey Jr Levi T Biofeedback system
US4754268A (en) * 1984-10-13 1988-06-28 Mitsuboshi Belting Ltd. Wireless mouse apparatus
US4800370A (en) * 1985-10-07 1989-01-24 I E Sensors, Inc. Wetness detection system
US4931772A (en) * 1985-11-14 1990-06-05 The Heil Company Safety monitor
US4906972A (en) * 1987-04-29 1990-03-06 The Boeing Company Communication system for hazardous areas
US4978946A (en) * 1987-08-13 1990-12-18 Talkie Tooter (Canada) Ltd. Personal security communication system
US4833725A (en) * 1987-09-10 1989-05-23 Teetor Thomas S Unintentional radio transmission detection system
US5036859A (en) * 1988-07-26 1991-08-06 Travis International, Inc. Moisture detector and indicator
US5045839A (en) * 1990-03-08 1991-09-03 Rand G. Ellis Personnel monitoring man-down alarm and location system
US5258743A (en) * 1991-07-29 1993-11-02 Uniplex Corporation Piezoelectric motion sensor
US5438320A (en) * 1993-04-09 1995-08-01 Figgie International Inc. Personal alarm system
US6198390B1 (en) 1994-10-27 2001-03-06 Dan Schlager Self-locating remote monitoring systems
US20070030156A1 (en) * 1994-10-27 2007-02-08 Dan Schlager Multi-hazard alarm system using selectable power-level transmission and localization
US8149112B2 (en) 1994-10-27 2012-04-03 Mosaid Technologies Incorporated Multi-hazard alarm system using selectable power-level transmission and localization
US20040113794A1 (en) * 1994-10-27 2004-06-17 Dan Schlager Self-locating personal alarm system equipped parachute
US5963130A (en) * 1996-10-28 1999-10-05 Zoltar Satellite Alarm Systems, Inc. Self-locating remote monitoring systems
FR2765989A1 (en) * 1997-07-11 1999-01-15 Godeux Michel J P Fall detection mechanism for old people surveillance
US6552652B2 (en) * 2000-11-09 2003-04-22 Synergy Microsystems, Inc. Rescue device
US6828908B2 (en) 2002-02-06 2004-12-07 Ronald Scott Clark Locator system with an implanted transponder having an organically-rechargeable battery
FR2839800A1 (en) * 2002-05-17 2003-11-21 Haute Frequence Ingenierie Alarm system for isolated workman includes radio transmitter communicating with station linked to telephone network to send pre-recorded message
US20040028190A1 (en) * 2002-08-05 2004-02-12 Golden Brian C. Condition awareness system
US20070114092A1 (en) * 2005-10-31 2007-05-24 Caterpillar Inc. Hydraulic brake and steering system
US8035560B1 (en) 2007-11-20 2011-10-11 Adrian Glodz System and apparatus for tracking a person or an animal
US20160275764A1 (en) * 2012-12-04 2016-09-22 Honeywell International Inc. Door/window contact system
US9659470B2 (en) * 2012-12-04 2017-05-23 Honeywell International Inc. Door/window contact system

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GB1226478A (en) 1971-03-31
DE1928137A1 (en) 1969-12-11

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